LG LS720, a mid-range Android model, breaks bread with the FCC
Not nearly the same amount of information is known about this device compared to what appears to be the LG Optimus G Pro for AT&T. We do know that the LG LS720 carries LTE bands compatible with Sprint and User Agent info suggests that this handset will launch with Android 4.1 installed out of the box. The model number, below LG's 800 series and 900 series suggests a mid-range device, perhaps even a sequel to the LG Optimus Slider (LG LS700) for Virgin Mobile.
source: FCC via Engadget